Syntheses, and Crystal and Molecular Structures of Tetramethylammonium[Aquamethanolhexakis(isothiocyanato)lanthanoidates(III)], [(CH3)4N]3[M(NCS)6(CH3OH)(H2O)] (M=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Er), and Tetramethylammonium [Heptakis(isothiocyanato)lanthanoidates(III)], [(CH3)4N]4[M(NCS)7](M=Dy, Er, Yb)

Abstract

Abstract The title complexes were synthesized and their crystal and molecular structures were determined by the X-ray diffraction method using their single crystals. The crystals of the former ten hexakis(isothiocyanato) complexes of lanthanum through dysprosium(III) and erbiun(III) are isomorphous with each other: monoclinic, space group P21, Z=2. The central metal atom is octa-coordinated, in a square-antiprism geometry, to six nitrogen atoms of thiocyanato (SCN) ions and two oxygen atoms of methanol and water molecules. The two oxygen atoms take the positions of the most approaching apexes of two squares. The latter three heptakis(isothiocyanato) complexes of dysprosium, erbium, and ytterbium are in another isomorphous form with each other: orthorhombic, space group P21nb, Z=4. The central metal atom is hepta-coordinated, in a deformed pentagonal-bipyramidal geometry, to seven nitrogen atoms of SCN ions.